docs: def morelikethis(self, index, doc_type, id, fields, **query_params):
          """
          Execute a "more like this" search query against one or more fields and get back search hits.
          """
          path = make_path(index, doc_type, id, '_mlt')
          query_params['mlt_fields'] = ','.join(fields)
          body = query_params["body"] if "body" in query_params else None
          return self._send_request('GET', path, body=body, params=query_params)